Temporary binder.



PATENTE) APR..14,-19oaf No. 384,351; l J. AHLBBRG.

TEMPORARY BINDER.

APPLICATION FILED FEB. Z0, 1907.

. what in advance of the inner edge of its back JACOB AHLERG, on CHICAGO, ILLINOIs.

TEMPORARY BINDER.

Specification of Letters Patent.

Patented April 14, 1908.

Application filed February 2.0, 1907. Serial No. 358,343.

To all whom it may concern.'

Be it known that I, JACOB AHLBERG, a citizen of the United States, residing at Chicago7 in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Temporary Binders, of which the following is a specification.

One of the objects of this invention is the production of an improved back or frame for temporary binders.

Another object of the invention is the production of .improved means for moving the clamping members of the binder back toward and away from each other.

The invention also relates to the other improvements in temporary binders hereinafter set forth.

In the accompanying drawings Figure 1 is a tplp plan or face view of a temporary binder bac embodying the features of my invention. In this view the binder back is represented as completely closed. Fig. 2 is a rear side view of said binder back, showing the same in full lines as closed, and in dotted lines as Opened or extended. Fig. 3 is a longitudinal central section through the binder back. Figs. 4 and 5 are detail sec-v tional views.

'Ihe present embodiment of this invention comprises a base plate 1 upon which are slidably -mounted two back members 2 and 3. Said back members are secured to the base plate 1 by means of two cylindrical rivets 4 fixed in each of the back members 2 .and 3, each of said rivets extending through an elongated opening 5 in the base plate 1. Said elongated o enings extend substantially to the longitu nal center line of the base plate. Each rivet 4 has an annular groove 6 therein to receive the walls of the elongated opening 5, thus providing a head (Fig. 4) which assists in holding the parts together. 1 One end of eachopening 5 is enlarged to permit of the entrance of the rivet 4 into said opening. The pair of rivets 4 upon the member 2 is staggered or out of alinement with the pair of vrivets upon the member 3, as shown in Fig. 1, and each pair of rivets is placed somemember, the edge of each back member being recessed or cutaway to accommodate the rivets upon the opposite back member.

The back members 2 formed of relatively thin sheet metal, I stien or strengthen said back members, to permit of setting the rivets 4 therein, by forming bosses 7 on said back member.

Each of the back members 2 and 3 comprises a clamping side iiange 8 preferably formed integral therewith. Each side member is also provided with end flanges 9 formed integral with a strip l() extending outside of the clamping side ianges 8. At the outer side of the strip 10 is a cover-attachment member 11 preferably of wood, the parts 8, 10 and 11 being secured together by means of screws 12. The side members 2 and 3 are guided in their movements and held in proper relation to the base plate 1 by means of two guide channels 13 formed by bending the ends of the base plate 1 into a plane at right angles with said plate and folding over a portion of said bent ends, as shown in Figs. 1 and 3, the overlapping end flanges 9 sliding within said guide channels.

In the present embodiment the means for moving the back members 2 and 3 toward and away from each other comprises two cam plates 14, each of said cam plates having two cam slots 15. therein adapted to receive the rivets 4. Each of the cam plates 14 is rotatably mounted upon a pivot pin 16 riveted or otherwise fixed in the base plate 1. To each cam plate 14 is fixed a pinion 17 having a blank portion 18.

The means herein shown for simultaneously rotating the cam plates 14 comprises a rack bar 19 having an elongated openin 2() therein near each of its ends. One waIl of each of the openin s 20 is adapted to slide in contact with the b ank portion 18 oi each of the pinions 1.7. In the opposite wall of each of said openings are formed rack teeth 21 adapted to mesh with the teeth of the pinions 17.

The rack bar 19 is longitudinally moved to rotate the pinions 17 and the cam plates 14 by means of a screw 22 engaging in a screwthreaded opening 23 in one end of said rack bar. Upon the screw 22 are formed two collars 24, between which lies a plate 25 having an opening 26 formed in one of its sides to receive said screw. Upon one edge oi the late 25 are two projecting portions V27 whic exand 3 preferably beingl tend into two openings 2S formed in the base late 1. One end of the screw 22 is shaped For en agement by a suitable key (not herein shown The mechanism upon the under side of the base plate 1 is inclosed by a cover plate 29 attached to said base plate by means of screws 30 extending vthrough said base plate into bosses 31 on said cover. On the inner side of the cover plate 29 are formed openings 32 into which the ends of the pivot pins 16 extend. A groove 33 is also formed in said cover plate to receive one edge of the plate 25, the latter being held in iixed position in said groove and the openings 2S.

To the inner faces of the side langes 8 of the back numbers 2 and 3 are fixed a plurality of leaf-holding pins 34 of common construction.

In ractice, the rear side of the cover plate 29 wi l be covered with leather or other suitable material.

In use, assuming the binder to be o en, as shown in dotted lines in Fig. 2, loose eaves, suitably notched, are placed upon the leafholding pins 34, and the back members 2 and 3 closed together to clamp the leaves in place by rotating the screw 22. The rotation of said screw moves the rack bar 19 longitudinally, oscillatin the pinions 17 and cam .lates 14 in the (Iirection of the arrow, Fig. 2. In their oscillation the cam plates 14 force `the rivets 4 upon one back member toward those upon the other by reason of the cam slot engagement between said cam plates andsaid rivets. An oscillation of the cam plates 14 in the opposite direction obviously will force the back members 2 and 3 apart, permitting the removal or insertion of leaves as desired.

I have illustrated and described my improvements in detail in the form at present preferred by me, but I am aware that they are ca able of considerable variation in structural details without-departing from my invention.

I claim as my invention:

1. In a temporary binder, in combination, two back members; and means for moving said back members. toward and away from each other comprising two pivotally; mounted members, a pinion fixed to eac of said last mentioned members at its pivotal center, each of said pinions having a blank portion, a rack bar having an elongated opening in each of its ends adapted to receive said pinions one wall of each of said openings eing plain to slide in contact with the blank portion of each of said pinions and gear teeth formed in the op oslte wall of each of said openings adapte to mesh with said pinions.

2. In a temporary binder, in combination, a base plate having four elongated openings therein; two back members slidably mounted upon the upper' side of' said ba'se plate;

plate, each of said cam plates having two cam slots therein into which extend the studs fixed to said back members.

3. In a temporary binder, in combination, a base plate having two pairs of elongated openings therein, the openings of each pair being out of alinement with each other and extending substantially to the longitudinal center of said base plate, two back members slidably mou'nted upon the upper side of said base plate; two studs fixed to each 0f said back members and extending through said elongated openings; and means for moving said back members comprising two cam plates pivotally mounted upon the rear side of said base plate, each lot said cam plates having two cam slots therein into which extend studs ixed to said back members.

4. In a tem orary binder, in combination, a base plate iaving two pairs of elongated openings therein, the openings of each pair being out of alinement with each other and extending substantially to the longitudinal center of said base plate; two back members slidably mounted upon the upper side of said base plate; two studs fixed to each of said back members at its inner edge and extending through said elongated openings; and means for moving said back members comprising two cam plates pivotally mounted upon the rear side of said base plate, each cam plate being mounted at a point between the openings of each pair of elongated openings, each of said cams having two cam slots therein into which extend the studs lixed to said back members.

5. In a temporary binder, in combination, a base plate; two back members slidably mounted upon the upper side thereof; two cam plates pivotally mounted upon the under side of said base plate and operatively connected with said back members; a pinion iixed to the under side of each of said cam plates at its pivotal center; a rack bar meshing with both of said pinions; a screw engaging one end of said rack bar, and held against longitudinal movement; and a cover plateattached to said base plate and inclosmg said cam plates, rack bar and screw.

6. In a temporary binder, in combination, a base plate; two back members slidably mounted u on the u er side thereof; two pivot pins ed in saidD ase plate and extendmg downwardly therefrom; a cam plate 'pzotally mounted ulpon each of said pivot pins and operativey'connected with said ack members; a pinion ixed to the under side of each of said 0am plates at its pivotal pivot pins; and means engaging said base plate and said cover for holding said screw againstlongitudinal movement.

JACOB AHLBERG.

center; a rack bar meshing with both of said pinions; a sereW engaging one end of said rack bar; a cover plate attached to said base plate and inclosing said cam plates7 rack bar, and screw, said cover plate having openings therem to receive the ends of said 

